Method of and apparatus for treating paper stock



May 13 1924. 1,493,535

A. .1. a -mue METHOD OF AND APPARATUS FOR TREATING PAPER STOCK FiledNOV. 21 1919 2 Sheets-Sheet 1 May 13 1924. 1,493,535

A. J. HAUG METHOD OF AND APPARATUS FOR TREATING PAPER STOCK Filed NOV.21 1919 Z'Sheets-Sheet 2 Patented May 13, 1924.

ui-rno siTArE'siiA eNro ANTON J. .HAUG,7 or NASHUA, new HAMPsHIRE,.AssIeNon T0 IMPROVED PAPER MACHINERY COMPANY, OF NASHUA, new HAMPSHIRE,a CORPORATION or MAINE.

METHOD or AND'APPARATUS Fen, TREATING PAPER s'roox.

Application filed November 21, 1919. Serial No. 339,566.

To all whom it may concern:

Be it known that I, ANTON J. HAUG, a citizen of the United States, and aresident of Nashua, county of Hillsborough, and State of New Hampshire,have invented an Improvement in Methods of and .Apparatus for TreatingPaper Stock, of which the following description, in connection with theaccompanying drawings, is a specification, like characters on thedrawings representing like parts.

This invention relates to methods of and apparatus for treating paperstock and more particularly to its treatment with reference to theremoval of moisturefrom thestock and the refinement of paper stockbroadly, in which the control of the moisture at some stage of thetreatment becomes an important consideration.

The invention will be best understood by reference to the followingdescription when taken in connection with the accompanying illustrationof one specific embodiment thereof, while its scope will be moreparticularly pointed out in the appe'nded claims.

In the drawings:

Figure l is a. longitudinal elevation in partial section, taken throughone form of apparatus which is adapted to carry out the invention as toone specific phase thereof;

Fig. 2 is an end elevation, partly in section, illustrating theapparatus of Fig. 1; and

F 3 is a side elevation, partly in section, showing more or lessdiagrammaticah ly and conventionally the employment of the apparatusillustrated in Fig. l 'to carry out one step in the process of pulprefinement.

teferring to the drawings and to the illustrated embodiment of theinvention therein shown and particularly to Figs. 1 and 2, the paperstock, which may be in any stage of refinement-either screened stockconsistency as to make itdesirab-le to remove more or less moisturetherefrom, is fed b-ygravity or otherwise along the stock conduit 1which is formed between the channel members 2 and the bottom plate 8 andat some appropriate point, such as the discharge opening 4, isdischarged upon a j is perforated or toward the surface of suitabledrainage surface 5, preferably by being allowed to drop thereon, thedropping ofthe stock upon such surface assisting in separating thesurplus moisture therefrom. While the drainage surface might be of someother suitable construction, herein it foraminous and is presented inthe form of aperforated plate or wire mesh of a size suitable to preventthe passage therethrough of the slivers or fibres beinghandle-d. WYhilethetdrainage member might be of some cross section other than circular,herein it is .in the form of a circular drum which is shown asencirclingthe stock conduit and adapted to receive the thin" or relatively Wetstock from the discharge opening at and deliver it through the open endof the: drum over the edge 6 into any suitable underlying receptacle(not ing discharged through the perforations in the drum into anysuitable underlying receptacle (not shown in Fig. 1). Preferably thedrum means are provided as to cause relative shown in Fig. 1), the Waterbe--' r 0 1S rota-table or such other i movement between the stock andthe drainiWiile the natural agitation of the stock resulting from itsbeing rolled over and over in travelinga'long the drum may be 9alonerelied upon or other suitable agitating devices may be employed,herein the drying or thickening action is assisted by the action of anexpressing device in the form-of a roller 7 also preferably slightlytapered or conical in shape to conform to the interior surface-of thedrum, the roller being adapted to bear against and roll freely-over thestock on the inner surface of the drum. and preferably being held atornear the point Where the accumulation of stock'naturally forms i. e.,near the" lower ascending side of the drum; The roller is herein shownso mounted "that-it is yieldably held the drum in such a way that a freemovement of the roller to and away from the drum is permitted. For thispurpose it is journaled in a bearing 9 carried at the end of a bent orsuitably shaped arm or bracket 11, the latter being fulcrumed at 13 onsome suitable fixed support. The weight of the roll and the arm alonemay be relied upon to give the necessary yielding pressure of the rollagainst the stock, but herein its weight is reinforced by otherpressureapplying means, preferably adjustable in its nature, as forexample the weight 15 which is suspended from the lower edge 17 of the.

bracket 11 the upper surface of the edge being notched and so arrangedthat the weight may be adjusted to different positions lengthwise thearm, thereby to adjust the pressure of the roller against the stock.

The moist stock, as it is delivered to the drum, tends to be carried upthe side thereof and as the side of the drum becomes steeper tends toroll or work back upon itself, this action ten ling both to agitate thestock and permit the water to drain therefrom as well as to work thestock gradually toward the discharge end of the drum. At the same timethe roller is yieldably pressed against th accumulations of stock whichtravel up with the drum and particularly those from which the moisturehas been partly removed by agitation along the lower portion of thedrum. In the course of op eration the fibres engaged by the roll tend toroll over and around the roll itself, which action assists in dryingthem out to the d'esired degree.

The thickening or drying of stock by some such method or apparatus ashas been herein described is frequently desirable in the refinement ofpaper stock, as for exam ple in the handling of tailings from some priorscreening operation when it is required to further refine or reduce thetailings for subsequent screening operations in order to make use of thegood fibres contained in the tailings. Such refining action commonlytakes the form of reducing the slivers contained in the tailings by acrushing or similar action and converting them es which on furtherscreening into fine in may be utilized in the refined product. \Vheresuch refining action is carried out, the degree of reduction, or thefibre length of the refined pulp which is turned out by the refiner, maybe varied not only by increasing the intensity or duration of therefining action but by varying the consistency of the supply. A thinsupply, that iscontaining a large amount of water, frequently tends toproducea long fibre, whereas a thick supply for the refiner, that is-onehaving a heavy consistency, with a lesser amount of water, may produce ashort fibre. It therefore often becomes desirable to thicken theconsistency of the tailings supplied to a refiner and also to exercisesome measure of control over the consistency.

In Fig. 3 I have shown a drying device of the type illustrated, in Figs.1 and 2 applied to a screening apparatus 20 adapted to receive thetailings therefrom; and, after removing the required amount of moisturetherefrom, deliver the latter to a refiner 21. The screening apparatus20 may be of any suitable type but is herein of the general type shownin my prior Patent No. 1,28%,668, dated Nov. 12, 1918, and specificallyof the, construction shown in my copending application Ser. No. 339,562,filed November 21, 1919. Such screening apparatus has the inlet 22through which paper stock is fed to the apparatus, which stock may be,for example, the tailin'gs from a prior screening operation by somesuitable centrifugal screen. The tailings screener 21 is provided with arotatable screen drum 23, driven by the driving pulley 24, and withsuitable stock-feeding passages contained in the feeding device 25. Bymeans of this apparatus the stock is agitated, lifted and droppedagainst the screening surface of the drum, being thinned and dilutedbetween successive screenings by the shower pipe 26 which deliversshower water to the screen drum 23 but not to the draining drum 5. Thefinally screened residue is delivered to the discharge conduit 1 andthereby to the drying drum 5, as already described, the screened stockpassing through the finestock outlet 27. The drying drum is hereinsecured to rotatable part 28 of the tailings screen drum 23 so as toturn therewith; and a suitable underlying casing 29 is provided to drainaway the water removed from th tailings.

The tailings from the screening apparatus 20, thus thickened by theaction of the drying drum 5 and the roller 7, are delivered to the inlet30 of the refiner 21. lVhile the refiner may be of any suitable type, itpreferably acts to operate upon the rejections from the tailingsscreener by a series of rolling or crushing actions, the number andpressure of which are predetermined, the stock being crushed by a seriesof rolls 31 and 32 which are supported in rotatable supports or spiders33 and caused to move through an orbital path over the stock within thecasing. Between each crushing action and the next, the stock is agitatedand advanced by a screw-conveyor device 34.

As delivered from the discharge end 35 of the refiner, the product hasbeen uniformly advanced and uniformly crushed, and consists ofrejections which are uniformly reduced in size and of suitableconsistency. The refiner 21 is only conventionally shown in Fig. 3, atype of such refiner being illustrated in detail inmy prior Patent No.1,302,469, dated April 29, 1919. By drying and suitably thickening theSupply to this refiner, the fineness of the fibres turned out at itsdischarge end may be materially increased and the product may bemaintained of a uniform quality.

The utilization ofthe drying apparatus in connection With the describedform of tailings screener and refiner merely illustrates one adaptationor application thereof. It will be understood that the drying apparatusherein described, and Widely varied in form and construction, may beutilized in various connections or combinations. The drying apparatusmay be constructed as a separate machine or as an attachment to va;

rious forms of paper machines. The drying processdescribed may beca-rried'out as a separate step of pulp refinement or in conjunctionwith other steps constituting part of the complete process. It will befurther understood that extensive deviations may be made from themechanical construct-ion herein described and from the form and relativearrangement of parts, allwithout departing from the spirit of theinvention.

Claims.

1. vAn apparatus for thickening paper stock comprising a rotarperforated drum with means for dropping moist stock on the inner surfaceof the drum and a rolleryieldably pressed against said drum near thelower, inner, ascending side thereof.

2. An apparatus for thickening paper stock comprising a rotary,cone-shaped drum having a foraminous draining surface, means fordeliveringstock to the interior of the drum near the smaller endthereof, said stock adapted to be discharged from the largerend of thedrum, a roller adapted to turn freely over the stock on th inner surfaceof the drum, said roller being yieldably pressed thereagainst.

An apparatus. for thickening paper stock comprising a draining drumadapted to receive the stock and a. pressureroller orking on the insideof the drum and having a fulcrumed support at a point outside the drumto permit a yieldable movement to and from the stock. v a

4. An apparatus for thickening paper stock comprising a stock-receivingdraining drum arranged for a continuous feed of stock thereto, means fordropping moist stock thereon, a roller adapted to turn freely over thestock on the interiorsurface of the.

drum, said roller being yieldably pressed thereagainst and a stockdischarge for. said drainage surface. i

5. An apparatus for thickening'paper stock comprising a rotaryperforated drum arranged for acontinuous feed of stock thcretowi'thmeans for dropping moist'stock on the inner surface of the drum andmeans charge for said drum.

. stock longitudinally ginterio'r of the drum and means moisturetherefrom by a.

thereto, yieldable expressing means adapted to engage the stock thereonanda stock dis-.-

.7. An apparatus .for thickening paper stock comprising a foraminousdraining drum adapted to receive stock on its inner surface and arrangedfor a continuous feed of stock thereto, and means to force the stockagainst the drum and express Water therefrom. f v

8. An apparatus for thickening paper tion longitudinally tapered, with,means for delivering stock to the interior of the drum, and means toengage the stock topressit' free from Water, charged vfrom the end ofthe drum.

9. An apparatus for j'thickening paper stock comprising a rotatable,foraminous drum having a circular cross-section and tapered, meansfordropping stock on the interior of the drum and a roller engaging thestock to drain the Water therefrom while the stock is advanced to- Wardthe delivery end of the drumr I 10. An appa'atus for thickeningpaperstock comprising a rotatable draining drum arranged for a continuousfeed of -11. An apparatus for thickening pap'er stock comprising arotatable draining drum arranged for .a continuous feed-of stockthereto, means for delivering. stock to the to assist in expressingwater ,therefronr and engaging thestock on the ascending side of thedrum.

12. An apparatus for thickening paper stock comprising a rotatabledraining drum arranged for a continuous feed of stock thereto, means todeliver stock to the interior thereof and means, movablerelatively tothe drum for engaging the stock therein to assistin removing themoisture therefrom.

13. The process of thickening moist paper stock which consists indropping the stock on a foraminous surface and expressingv advancing thestock along the surface in the direction of thel ength of the roller.

14. The process of thickening moist paper stock'which consists indelivering the stock to a foraminoussurface, causing such-relae tivemovementbetween the stock and. the surface as to turn thestocko-verthereon Whileprogressively advancing it along the the drainedstock being disroller agency while i comprising a. rotatable,foraminous, draining drum having a circular cross-secstock thereto,means for delivering moist,

stock to the interior of the drum and means iii surface and at the sametime pressing the stock to expel moisture therefrom.

15. The combination with a screen having a tailings outlet of a dryingdevice comprising a rotary draining drumadapted to receive said tailingson its inner surface and drain the water therefrom, said drum havingseparate discharge passages for the water and the thickened tailings andhaving also means to express the water from the tailings.

16. The combination with a screen having means for screening paper stockand for diluting and rescreening the unscreened residue of a dryingdevice comprising a rotary draining drum adapted to receive the tailingson its inner surface and drain the water therefrom and having separatedischarge passages for the water and the thickened tailings and a rollerto express the water from the tailings.

17. The combination with a screen having a tailings outlet of a rotarydrainage drum to the inner surface of which said tailings may bedelivered and a roller engaging the tailings on the inner surface of thedrum.

18. The combination with a screen having a tailings outletof a rotarydrainage drum to the inner surface of which said tailings may bedelivered and a roller yieldably pressed against the tailings on theinner surface of the drum.

19. The combination with a screen having a tailings outlet of a dryingdevice comprising a rotatable draining drum adapted to receive thetailings on its inner surface and means to express water there from.

20. The combination with a screen having a tailings outlet. of a rotarydraining drum with the interior of which said tailings outletcon'nnunicates, means movable relatively to the drum for engaging thetailings therein and separate discharge passa'tge's for the thickenedtailings and the water withdrawn therefrom.

21. The combination with a screen having a tailings outlet of a drainagesurface uponv which said t'ailings are discharged and expressing meansfor expressing water from the tailings on said surface.

22. The combination with a screen having a tailings outlet of a drainagesurface to receive the tailings and a roller adapted to pass over thetailings thereon and remove moisture therefrom.

23. The process of working paper stock which consists in first.screening the stock and separating the fine fibre from the tailings,withdrawing the tailings and feeding them to a rotary draining surfaceand removing moisture from the tailings by expressing the moisturetherefrom.

24. The process of working paper stock which consists in screening thestock, diluting and r'escreening the residue, withdrawing the finaltailings dropping the latter on a foraminous surface and thickening themby withdrawing the moisture therefrom by combined expressing anddrainage.

25. The process of working paper stock which consists in screening thestock, diluting and rescreening the residue, withdrawing the tailingsdropping the latter on a forammous surface and expresslng water from thetalhngs by a rolling agency to thicken the same.

26. The process of working paper stock which consists in screening thestock, diluting and rescreening the residue, dropping the final tailingson a foraminous surface and expressing water therefrom by a rollingagency applied while the tailings are in contact with said surface.

27. In an apparatus for working paper stock, the combination with a drumscreen of means attached thereto and operated I with the drum thereoffor drying or thickening the tailings from said screen and means forreducing the thickened tailings while thickened to finer fibres forrescreen- 28. In an apparatus for Working paper stock, the combinationwith a screen having means to screen the stock and dilute and rescreenthe unscreened residue of a drying device connected to said screen forextracting moisture from the tailings and a refiner having crushingmeans adapted to reduce the thickenedtailing's.

29. In an apparatus for Working paper stock, the combination with ascreen of a foramii'ious draining surface adapted to receive thetailings from the screen, said surface being relatively movable withreference to the tailings and a refining device for subjecting thethickened tailings to a rolling action predetermined in amount.

30. In an apparatus for screening paper stock, the combination With ascreen having means for screening the stock and diluting and rescreeningthe unscreened residue of a rotary draining drum to receive thetailings, a roller working within the drum and against the ta-ilingscontained therein and a refiner adapted to refine the tailings by aseries of rolling actions.

31. The process of working paper stock which consists in screening thestock, thickening the tailings to remove moisture therefrom continuouslyfeeding the tailings to a crushing agency and crushing the thickenedta-ilings.

32. The process of refining stock which consists in screening the stock,diluting and rescreening the unscreened residue one or more times,extracting moisture from the tailings, thickening the same continuouslyfeeding the. tailings to a rolling agency and repeatedly rolling thethickened tailings to refine the same. rolling agency and refining thethickened 33. The process of Working paper stock tailings by said secondrolling agency. which consists in screening the stock, dry-- Intestimony whereof, I have signed my10 5 ing the tailings by a rollingagency, acting name to this specification.

in conjunction With a draining surface con- ANTON J. HAUG.

tinuously feeding the tailings' to a second

